US20200013535A1 - Transformer oil, transformer oil evaluation method, and transformer oil evaluation apparatus - Google Patents

Transformer oil, transformer oil evaluation method, and transformer oil evaluation apparatus Download PDF

Info

Publication number
US20200013535A1
US20200013535A1 US16/493,534 US201816493534A US2020013535A1 US 20200013535 A1 US20200013535 A1 US 20200013535A1 US 201816493534 A US201816493534 A US 201816493534A US 2020013535 A1 US2020013535 A1 US 2020013535A1
Authority
US
United States
Prior art keywords
transformer oil
oil
magnetic particles
transformer
accommodation section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US16/493,534
Other languages
English (en)
Inventor
Hiroshi Yamaguchi
Haruhiko Yamasaki
Tatsuo Kawaguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guccicreate Co Ltd
Sakura Seiyusho Co Ltd
Original Assignee
Sakura Seiyusho Co Ltd
Doshisha Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sakura Seiyusho Co Ltd, Doshisha Co Ltd filed Critical Sakura Seiyusho Co Ltd
Assigned to SAKURA SEIYUSHO CO. LTD., THE DOSHISHA reassignment SAKURA SEIYUSHO CO. LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAWAGUCHI, TATSUO, YAMAGUCHI, HIROSHI, YAMASAKI, HARUHIKO
Publication of US20200013535A1 publication Critical patent/US20200013535A1/en
Assigned to GUCCICREATE CO., LTD reassignment GUCCICREATE CO., LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: THE DOSHISHA
Abandoned legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
    • C10M101/04—Fatty oil fractions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/50—Lubricating compositions characterised by the base-material being a macromolecular compound containing silicon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/20—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/46—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes silicones
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/46—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes silicones
    • H01B3/465—Silicone oils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/44—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids
    • H01F1/447—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids characterised by magnetoviscosity, e.g. magnetorheological, magnetothixotropic, magnetodilatant liquids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/105—Cooling by special liquid or by liquid of particular composition
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/40—Fatty vegetable or animal oils
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/40—Fatty vegetable or animal oils
    • C10M2207/401—Fatty vegetable or animal oils used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/02—Unspecified siloxanes; Silicones
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/02—Unspecified siloxanes; Silicones
    • C10M2229/025—Unspecified siloxanes; Silicones used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/02—Viscosity; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/055—Particles related characteristics
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/055—Particles related characteristics
    • C10N2020/06—Particles of special shape or size
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/64—Environmental friendly compositions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/14—Electric or magnetic purposes
    • C10N2040/16—Dielectric; Insulating oil or insulators
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/14—Electric or magnetic purposes
    • C10N2040/185—Magnetic fluids
    • C10N2220/022—
    • C10N2230/64—

Definitions

  • the present invention relates to a transformer oil, a transformer oil evaluation method, and a transformer oil evaluation apparatus.
  • transformer oil As an oil for insulating and cooling a transformer (hereinafter, transformer oil), conventionally, a mineral-derived oil (hereinafter, mineral oil) has been used, but there is a problem in that the mineral oil causes soil contamination or water contamination. For this reason, in recent years, a plant-derived oil (hereinafter, plant oil) having high environmental compatibility has been proposed to be used as a transformer oil (for example, see Patent Document 1).
  • the problem of soil contamination or water contamination is solved by using a plant oil as the transformer oil.
  • the plant oil has a high kinetic viscosity, and thus a further improvement in transformer cooling properties cannot be expected.
  • the present invention was made in view of the above-described circumstances, and an object thereof is to provide a transformer oil that has high environmental compatibility and is expected to be further improved in transformer cooling properties, and a method and apparatus for evaluating the transformer oil.
  • a transformer oil according to the present invention is a transformer oil prepared by mixing a plant oil and a silicone oil and containing no mineral oil, in which
  • a volume ratio of the plant oil to the silicone oil is 3:7 to 7:3, and
  • a volume concentration of the magnetic particles is 10 to 30%.
  • a surfactant is adsorbed to surfaces of the magnetic particles.
  • the magnetic particles are temperature-sensitive magnetic particles whose magnetization is reduced according to an increase in temperature in a normal temperature range.
  • a method for evaluating a transformer oil prepared by mixing a plant oil, a silicone oil, and magnetic particles and containing no mineral oil including:
  • the magnetic particles are temperature-sensitive magnetic particles whose magnetization is reduced according to an increase in temperature in a normal temperature range
  • a magnetic field gradient in which magnetization is reduced from the other side to the one side is generated in the transformer oil.
  • an apparatus for evaluating a transformer oil according to the present invention is
  • an apparatus for evaluating a transformer oil prepared by mixing a plant oil, a silicone oil, and magnetic particles and containing no mineral oil including:
  • the magnetic particles are temperature-sensitive magnetic particles whose magnetization is reduced according to an increase in temperature in a normal temperature range.
  • the present invention it is possible to provide a transformer oil that has high environmental compatibility and is expected to be further improved in transformer cooling properties, and a method and apparatus for evaluating the transformer oil.
  • FIG. 1 is a diagram for describing an effect of temperature-sensitive magnetic particles
  • FIG. 2 is a center cross-sectional view of a transformer oil evaluation apparatus according to an embodiment of the present invention.
  • a transformer oil according to the present embodiment is prepared by mixing a plant oil and a silicone oil.
  • the transformer oil of the present embodiment contains no mineral oil that causes soil contamination or water contamination. For this reason, the transformer oil of the present embodiment has high environmental compatibility and can be recycled.
  • the transformer oil of the present embodiment prepared by mixing the silicone oil with plant oil has a smaller kinetic viscosity than a conventional transformer oil composed of only a plant oil. That is, since the transformer oil of the present embodiment more easily generates a convection flow in a transformer than the conventional transformer oil and heat transfer properties are improved, an improvement in transformer cooling properties can be expected.
  • the plant oil and the silicone oil may be contained in a the volume ratio range of 3:7 to 7:3.
  • the volume ratio of the plant oil to the silicone oil in a range of 3:7 to 7:3, the kinetic viscosity is adjusted so that a transformer oil having desired heat transfer properties can be provided.
  • magnetic particles having an average particle diameter of 1 nm to 10 ⁇ m are dispersed.
  • the volume concentration of the magnetic particles in the transformer oil is 10 to 30%.
  • a surfactant is adsorbed to surfaces of the magnetic particles. For this reason, the magnetic particles act repulsively to each other, and dispersibility of the magnetic particles is improved.
  • temperature-sensitive magnetic particles for example, manganese zinc ferrite
  • a normal temperature range for example, 5° C. to 35° C.
  • FIG. 1 in a case where a magnetic fluid containing temperature-sensitive magnetic particles is accommodated in a space A in a state of applying an external magnetic field H, when the upper side of the space A is cooled and the lower side thereof is heated, the magnetization of the magnetic fluid increases at the upper side of the space A and the magnetization decreases at the lower side, so that a magnetic field gradient according to a temperature difference is generated.
  • the transformer oil evaluation apparatus is a transformer oil evaluation apparatus for evaluating a transformer oil prepared by mixing a plant oil, a silicone oil, and magnetic particles and containing no mineral oil.
  • a transformer oil evaluation apparatus 1 includes a cylindrical acrylic case 2 , a cylindrical metal section 3 provided at a center of the acrylic case 2 , a coil section 4 provided in an outer circumference of the metal section 3 , an annular first accommodation section 5 provided in an outer circumference of the coil section 4 , and an annular second accommodation section 6 provided in an outer circumference of the first accommodation section 5 .
  • the transformer oil is accommodated in the first accommodation section 5 , and cooling water is accommodated in the second accommodation section 6 .
  • the coil section 4 is heated by a current being allowed to flow into the coil section 4 , so that a temperature difference can be generated between the coil section 4 side of the first accommodation section 5 and the second accommodation section 6 (cooling water) side and a convection flow can be generated in the transformer oil.
  • a magnetic field gradient according to the temperature difference is generated, so that the convection flow of the transformer oil is promoted.
  • the transformer oil evaluation apparatus 1 preferably includes a first detection unit 7 detecting a temperature of the transformer oil at the upper part of the first accommodation section 5 , a second detection unit 8 detecting a temperature of the transformer oil at the lower part of the first accommodation section 5 , and a calculation unit 9 configured by a computer or the like.
  • the detection results of the first detection unit 7 and the second detection unit 8 are transmitted to the calculation unit 9 .
  • the calculation unit 9 performs various calculations (for example, calculation of a Nusselt number described later) and evaluates the transformer oil.
  • the transformer oil evaluation method is a transformer oil evaluation method for evaluating a transformer oil prepared by mixing a plant oil, a silicone oil, and magnetic particles and containing no mineral oil, and the method includes the following first step and second step.
  • one side of an accommodation section in which the transformer oil is accommodated is heated and the other side facing the one side is cooled, so that a temperature difference is generated between the one side and the other side and a convection flow is generated in the transformer oil.
  • the coil section 4 positioned at one side of the first accommodation section 5 is heated and the second accommodation section 6 positioned at the other side of the first accommodation section 5 is cooled by cooling water. According to this, a temperature difference can be generated between the coil section 4 side of the first accommodation section 5 and the second accommodation section 6 side and a convection flow can be generated in the transformer oil. In a case where temperature-sensitive magnetic particles are dispersed in the transformer oil, a magnetic field gradient according to the temperature difference is generated, so that the convection flow of the transformer oil is promoted.
  • a Nusselt number of the transformer oil is calculated and the transformer oil is evaluated on the basis of the Nusselt number by using the calculation unit 9 .
  • a magnetic Rayleigh number is calculated together with the Nusselt number and the transformer oil is evaluated on the basis of the Nusseit number with respect to the magnetic Rayleigh number.
  • the Nusselt number (Nu) can be calculated from the following Formula (1).
  • the calculation unit 9 can calculate a temperature difference (characteristic temperature difference ⁇ T) between the upper part and the lower part of the first accommodation section 5 acquired from the first detection unit 7 and the second detection unit 8 and can calculate the Nusselt number of the transformer oil in the first accommodation section 5 .
  • a characteristic length L is a height of the first accommodation section 5 .
  • the Nusselt number increases, a convection flow is easily generated in the transformer and an improvement in transformer cooling properties can be expected.
  • the Nusselt number increases.
  • a change ratio of the Nusselt number to the magnetic Rayleigh number increases, a transportation amount of heat with a small temperature difference can increase.
  • the change ratio decreases as the ratio of the silicone oil decreases.
  • magnetic particles of the present invention arbitrary magnetic particles can be used as long as they exhibit ferromagnetic properties. Temperature-sensitive magnetic particles other than manganese zinc ferrite may be used. In addition, as long as particles are dispersed in the transformer oil, the average particle diameter of the magnetic particles can be changed or a surfactant can be omitted.
  • the plant oil of the present invention an arbitrary plant-derived oil can be used, and as the silicone oil of the present invention, an arbitrary silicone oil can be used.
  • the transformer oil of the present invention may contain other oils or other magnetic fluids as long as the transformer oil is prepared by mixing a plant oil, a silicone oil, and magnetic particles and contains no mineral oil.
  • the transformer oil has been evaluated on the basis of the Nusselt number with respect to the magnetic Rayleigh number, but the transformer oil evaluation method of the present invention may be configured such that the transformer oil can be evaluated on the basis of at least a Nusselt number magnitude relationship.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Power Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Transformer Cooling (AREA)
  • Organic Insulating Materials (AREA)
US16/493,534 2017-03-13 2018-03-09 Transformer oil, transformer oil evaluation method, and transformer oil evaluation apparatus Abandoned US20200013535A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2017-047617 2017-03-13
JP2017047617 2017-03-13
PCT/JP2018/009188 WO2018168684A1 (ja) 2017-03-13 2018-03-09 トランスオイル、トランスオイル評価方法およびトランスオイル評価装置

Publications (1)

Publication Number Publication Date
US20200013535A1 true US20200013535A1 (en) 2020-01-09

Family

ID=63523174

Family Applications (1)

Application Number Title Priority Date Filing Date
US16/493,534 Abandoned US20200013535A1 (en) 2017-03-13 2018-03-09 Transformer oil, transformer oil evaluation method, and transformer oil evaluation apparatus

Country Status (5)

Country Link
US (1) US20200013535A1 (zh)
EP (1) EP3598463A4 (zh)
JP (1) JPWO2018168684A1 (zh)
CN (1) CN110431645A (zh)
WO (1) WO2018168684A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112210425A (zh) * 2020-09-02 2021-01-12 江苏双江能源科技股份有限公司 一种天然酯变压器油及其制备方法
US11015987B2 (en) * 2016-06-07 2021-05-25 Mitsubishi Electric Corporation Temperature estimation method

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5462685A (en) * 1993-12-14 1995-10-31 Ferrofluidics Corporation Ferrofluid-cooled electromagnetic device and improved cooling method
JP3145301B2 (ja) * 1996-03-21 2001-03-12 株式会社関西テック 電気絶縁油及びその製造方法
US5863455A (en) * 1997-07-14 1999-01-26 Abb Power T&D Company Inc. Colloidal insulating and cooling fluid
JPH11306864A (ja) * 1998-04-20 1999-11-05 Kansai Tech Corp 電気絶縁油及びその製造方法
SE515900C2 (sv) * 2000-01-14 2001-10-22 Abb Ab Kraftkondensator och användning och förfarande vid sådan
JP2001291626A (ja) * 2000-04-07 2001-10-19 Nippon Koei Yokohama Works Co Ltd 電気機器温度のシミュレーション方法及びこのシミュレーションによる電気機器の余寿命算出方法
CN100533604C (zh) * 2003-08-27 2009-08-26 狮王株式会社 电绝缘油用基剂
WO2012091805A2 (en) * 2010-12-30 2012-07-05 Union Carbide Chemicals & Plastics Technology Llc Method of removing impurities from natural ester, oil-based dielectric fluids
CN202384154U (zh) * 2011-12-06 2012-08-15 四川省电力公司广安电业局 低损耗电力变压器
JP5923971B2 (ja) * 2011-12-26 2016-05-25 株式会社明電舎 移動用変圧器
JP2016025223A (ja) 2014-07-22 2016-02-08 愛知電機株式会社 植物系絶縁油を使用する変圧器の製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11015987B2 (en) * 2016-06-07 2021-05-25 Mitsubishi Electric Corporation Temperature estimation method
CN112210425A (zh) * 2020-09-02 2021-01-12 江苏双江能源科技股份有限公司 一种天然酯变压器油及其制备方法

Also Published As

Publication number Publication date
EP3598463A4 (en) 2020-11-25
EP3598463A1 (en) 2020-01-22
JPWO2018168684A1 (ja) 2020-01-16
WO2018168684A1 (ja) 2018-09-20
CN110431645A (zh) 2019-11-08

Similar Documents

Publication Publication Date Title
Musiolik et al. Contacts of water ice in protoplanetary disks—laboratory experiments
Abdollahi et al. Experimental study to obtain the viscosity of CuO-loaded nanofluid: effects of nanoparticles’ mass fraction, temperature and basefluid’s types to develop a correlation
Wang et al. Investigation on viscosity of Fe3O4 nanofluid under magnetic field
Srinivas et al. Effects of thermal radiation and space porosity on MHD mixed convection flow in a vertical channel using homotopy analysis method
Aminfar et al. A 3D numerical simulation of mixed convection of a magnetic nanofluid in the presence of non-uniform magnetic field in a vertical tube using two phase mixture model
Heyhat et al. Experimental investigation of laminar convective heat transfer and pressure drop of water-based Al2O3 nanofluids in fully developed flow regime
Aminfar et al. Numerical study of the ferrofluid flow and heat transfer through a rectangular duct in the presence of a non-uniform transverse magnetic field
Sundar et al. Experimental investigation of forced convection heat transfer and friction factor in a tube with Fe3O4 magnetic nanofluid
Kubík et al. A magnetorheological fluid shaft seal with low friction torque
Doganay et al. Effect of external magnetic field on thermal conductivity and viscosity of magnetic nanofluids: A review
Joubert et al. Enhancement in heat transfer of a ferrofluid in a differentially heated square cavity through the use of permanent magnets
US20200013535A1 (en) Transformer oil, transformer oil evaluation method, and transformer oil evaluation apparatus
Kedzierski R134a/Al2O3 nanolubricant mixture pool boiling on a rectangular finned surface
Kim et al. A comprehensive viscosity model for micro magnetic particle dispersed in silicone oil
Yildirim et al. Experimental study on heat transfer of the magnetorheological fluids
Linke et al. Anisotropy of the magnetoviscous effect in a ferrofluid with weakly interacting magnetite nanoparticles
Basu et al. Flow boiling of R134a in circular microtubes—Part II: Study of critical heat flux condition
Gołdasz et al. Magnetostatic analysis of a pinch mode magnetorheological valve
Bossis et al. The role of volume fraction and additives on the rheology of suspensions of micron sized iron particles
Wen et al. Monitoring sedimentation of magnetorheological fluids using a vertical axis monitoring system with a low aspect ratio sensor coil
Moshizi et al. Mixed convection of magnetohydrodynamic nanofluids inside microtubes at constant wall temperature
Kedzierski et al. Pool boiling of low-global warming potential replacements for R134a on a reentrant cavity surface
Rahim et al. Thermal conductivity enhancement and sedimentation reduction of magnetorheological fluids with nano-sized Cu and Al additives
Huang et al. The application of temperature-sensitive paints for surface and fluid temperature measurements in both thermal developing and fully developed regions of a microchannel
Kariganaur et al. Influence of temperature on magnetorheological fluid properties and damping performance

Legal Events

Date Code Title Description
AS Assignment

Owner name: SAKURA SEIYUSHO CO. LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YAMAGUCHI, HIROSHI;YAMASAKI, HARUHIKO;KAWAGUCHI, TATSUO;SIGNING DATES FROM 20190903 TO 20190911;REEL/FRAME:050360/0043

Owner name: THE DOSHISHA, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YAMAGUCHI, HIROSHI;YAMASAKI, HARUHIKO;KAWAGUCHI, TATSUO;SIGNING DATES FROM 20190903 TO 20190911;REEL/FRAME:050360/0043

AS Assignment

Owner name: GUCCICREATE CO., LTD, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:THE DOSHISHA;REEL/FRAME:053725/0127

Effective date: 20200819

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION